Note: Values are means +/- standard deviations.aSpring, 21 March to 20 June 1985; summer, 21 June to 22
September 1985; autumn, 23 September to 21 December 1985; winter, 22
December 1985 to 28 February 1986; annual, 21 March 1985 to 28
February 1986. The number of observations is given in parentheses.